import java.util.Base64;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;

public class AES {

  /**
   * 加密算法
   *
   * @param sSrc 加密字符串
   * @param sKey 密钥
   * @return
   * @throws Exception
   */
  public static String Encrypt(String sSrc, String sKey) throws Exception {
    if (sKey == null) {
      System.out.print("Key为空null");
      return null;
    }
    // 判断Key是否为16位
    if (sKey.length() != 16) {
      System.out.print("Key长度不是16位");
      return null;
    }
    byte[] raw = sKey.getBytes("utf-8");
    SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding"); // "算法/模式/补码方式"
    cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
    byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));

    String result = Base64.getEncoder().encodeToString(encrypted);
    return java.net.URLEncoder.encode(result, "UTF-8"); // 此处使用BASE64做转码功能，同时能起到2次加密的作用。
  }

  /**
   *
   * @param sSrc 解密字符串
   * @param sKey 解密算法
   * @return
   * @throws Exception
   */
  public static String Decrypt(String sSrc, String sKey) throws Exception {
    try {
      // 判断Key是否正确
      if (sKey == null) {
        System.out.print("Key为空null");
        return null;
      }
      // 判断Key是否为16位
      if (sKey.length() != 16) {
        System.out.print("Key长度不是16位");
        return null;
      }
      byte[] raw = sKey.getBytes("utf-8");
      SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
      Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
      cipher.init(Cipher.DECRYPT_MODE, skeySpec);
      try {
        sSrc = java.net.URLDecoder.decode(sSrc, "UTF-8");
        byte[] encrypted1 = Base64.getDecoder().decode(sSrc); // 先用base64解密
        byte[] original = cipher.doFinal(encrypted1);
        String originalString = new String(original, "utf-8");
        return originalString;
      } catch (Exception e) {
        System.out.println(e.toString());
        return null;
      }
    } catch (Exception ex) {
      System.out.println(ex.toString());
      return null;
    }
  }

  public static void main(String[] args) throws Exception {
    /*
     * 此处使用AES-128-ECB加密模式，key需要为16位。
     */
    String cKey = "LwbPsFsjYyWorEdD";
    // 需要加密的字串
    String cSrc = "www.moranblog.cn";

    System.out.println(cSrc);
    // 加密
    String enString = AES.Encrypt(cSrc, cKey);
    System.out.println("加密后的字串是：" + enString);

    // 解密
    String DeString = AES.Decrypt(enString, cKey);
    System.out.println("解密后的字串是：" + DeString);
  }
}
